Acids & Bases Overview
Acids & Bases Overview
It is essential for students to know …
 that substances can be classified as
acids, bases or neutr...
Acids & Bases - pH
The pH scale is a way to measure how acidic
or basic a solution is.
 The pH range of a solution is bet...
Acids & Bases - Acid
Acids can be identified by their…
 sour taste (for example lemons and
oranges contain acids)
 react...
Acids & Bases - Base
Bases can be identified by their…
 bitter taste (for example, unsweetened
cocoa has a bitter taste)
...
Acids & Bases - Neutral
Solution
It is neither an acid nor a base (for
example, pure water is a neutral
solution and has a...
INDICATORS
Indicators
It is essential for students to know…
 how to use indicators (including litmus
paper, phenolphthalein, and pH ...
Indicators - Litmus paper
Has a special dye on it that changes
colors in the presence of an acid or
base.
 Blue litmus pa...
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G8 science chemistry - acids & bases

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G8 science chemistry - acids & bases

  1. 1. Acids & Bases Overview
  2. 2. Acids & Bases Overview It is essential for students to know …  that substances can be classified as acids, bases or neutral based on their pH.  acids and bases are solutions usually with water as the solvent.
  3. 3. Acids & Bases - pH The pH scale is a way to measure how acidic or basic a solution is.  The pH range of a solution is between 0 and 14.  The pH of pure water is 7 ◦ Any solution with a pH of 7 is neutral solution. It is not an acid or a base.  The pH of an acidic solution is less than 7 ◦ The lower the number, the more acidic the solution.  The pH of a basic solution is greater than 7 ◦ The higher the number, the more basic the solution.
  4. 4. Acids & Bases - Acid Acids can be identified by their…  sour taste (for example lemons and oranges contain acids)  reaction with some metals such as zinc  reaction with bases to form a neutral pH solution (for example, vinegar reacting with limestone).
  5. 5. Acids & Bases - Base Bases can be identified by their…  bitter taste (for example, unsweetened cocoa has a bitter taste)  by its slippery feel (for example, dish detergent)  by its reaction with acids to form a neutral pH solution (for example, an antacid to soothe an acid stomach).
  6. 6. Acids & Bases - Neutral Solution It is neither an acid nor a base (for example, pure water is a neutral solution and has a pH of ~7.0)
  7. 7. INDICATORS
  8. 8. Indicators It is essential for students to know…  how to use indicators (including litmus paper, phenolphthalein, and pH paper) to determine the relative pH of a solution.  Indicators are substances that can be used to determine whether a solution is acidic, basic, or neutral.
  9. 9. Indicators - Litmus paper Has a special dye on it that changes colors in the presence of an acid or base.  Blue litmus paper turns red in an acid, and stays blue in a base.  Red litmus paper turns blue in a base, and stays red in an acid.  Both red and blue litmus paper turn violet in a solution that is neutral (neither an acid nor a base).

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